HUBUNGAN PANJANG-PANJANG, POLA PERTUMBUHAN DAN KONDISI IKAN NYALIAN, Barbodes binotatus (VALENCIENNES, 1842) DI EMPAT DANAU DI PULAU BALI

The relationship between length type, length-weight relationship and condition factors is an initial approach to fisheries management. Research related to that issue on spotted barb (Barbodes binotatus) in four lake ecosystems in Bali has never been published. This study aims to reveals information related to the relationship of length character, growth patterns and conditions of B. binotatus in four lake ecosystems in Bali. Fish sampling was carried out from August 2017 to July 2018 at Tamblingan Lake, Buyan Lake, Beratan Lake and Batur Lake which were carried out alternately. The results of this study revealed that the total length (TL), fork length (FL) and standard length (SL), each type of measurement can be used to estimate the weight of B. binotatus, but standard length was the most suitable type of measurement in estimating weights. This fish species has a positive allometric growth pattern (b>3) with an estimated condition that is in good condition

KARAKTER PANJANG, HUBUNGAN PANJANG-BOBOT DAN KONDISI IKAN NYALIAN BULUH (Rasbora argyrotaenia BLEEKER, 1849) DI CATUR DANU BALI

Ikan nyalian buluh (Rasbora argyrotaenia) merupakan spesies ikan yang menyebar di catur danu Bali. Penelitian karakter biologi spesies ikan ini di catur danu Bali masih terbatas. Penelitian ini dilakukan dari Agustus 2017 sampai Juli 2018 dengan tujuan untuk memperoleh hubungan karakter panjang, hubungan panjang-bobot dan dugaan kondisi ikan nyalian buluh di catur danu Bali. Sampling dilakukan dengan metode purposive sampling yang dilakukan secara bergantian setiap bulannya. Hasil menunjukkan hubungan karakter panjang ikan nyalian buluh di catur danu Bali memiliki korelasi kuat untuk tiap tipe pengukuran (R>0,96). Persamaan hubungan panjang-panjang ikan nyalian buluh di Danu Tamblingan, PC = 1,1217PB - 0,9947; PT = 1,1759PB + 3,657; PT = 1,0525PC + 4,5435, di Danu Buyan, PC = 1,091PB + 1,7375; PT = 1,1785PB + 3,029; PT = 1,0742PC + 1,5009, di Danu Beratan, PC = 1,091PB + 2,7818; PT = 1,178PB + 4,8692; PT = 1,0751PC + 2,2718 dan di Danu Batur, PC = 1,105PB + 1,7529; PT = 1,2051PB + 3,3616; PT = 1,0863PC + 1,8183. Ukuran panjang baku (PB) menjadi penduga bobot paling akurat ikan nyalian buluh di catur danu Bali. Pola pertumbuhan panjang-bobot bersifat alometrik positif dan isometrik, serta masih berada dalam kondisi baik dengan nilai faktor kondisi relatif antara 0,62-1,40.Silver rasbora (Rasbora argyrotaenia) is a fish species that inhabits in four lakes in Bali. Research related to biological character for this species is limited in four lakes in Bali. This research was conducted from August 2017 to July 2018 withthe aims of this research was to revealcharacteristic of length, length-weight relationship and condition of silver rasbora in four lakes in Bali. Sampling method is purposive sampling which did alternately every month. The result shown, length-length relationship of silver rasbora in four lakes in Bali has strong correlation (R>0.96) for each measurement method. The equation of length-length relationship silver rasbora in Tamblingan Lake, FL = 1.1217SL - 0.9947; TL = 1.1759SL + 3.657; TL = 1.0525FL + 4.5435, in Buyan Lake, FL = 1.091SL + 1.7375; TL = 1.1785SL + 3.029; TL = 1.0742FL + 1.5009, in Beratan Lake, FL = 1.091SL + 2.7818; TL = 1.178SL + 4.8692; TL = 1.0751FL + 2.2718 andin Batur Lake, FL = 1.105SL + 1.7529; TL = 1.2051SL + 3.3616; TL = 1.0863FL + 1.8183.The standard length (SL) is the most accurate measure in estimating the weight for silver rasbora in four lakes in Bali. The growth patterns of silver rasbora are positive allometric and isometric, andstill in good condition with a relative condition factor value ranging between 0.62-1.40

Epifauna pada Ekosistem Mangrove di Kawasan Taman Hutan Raya Ngurah Rai, Bali

Epifauna merupakan makrozoobentos yang hidup di permukaan sedimen perairan atau menempel pada berbagai substrat perairan maupun pada organisme lain. Salah satu kawasan perairan yang sering dijadikan habitat oleh epifauna adalah ekosistem mangrove. Penelitian ini bertujuan untuk mengetahui jenis dan kelimpahan epifauna, jenis dan kerapatan mangrove, serta kondisi lingkungan (air dan substrat) pada ekosistem mangrove di Tahura Ngurah Rai, Bali. Penelitian ini dilakukan menggunakan metode Purposive Random Sampling dengan transek berpetak. Jenis epifauna yang ditemukan di Tahura Ngurah Rai, Bali terdiri dari 15 jenis (Terebralia sulcata, Nerita planospira, Cerithidea quoyii, Telescopium tellescopium, Littoraria lutea, Littoraria scabra, Littoraria carinifera, Littoraria pallescens, Pila ampullaceal, Nerita melanotragus, Cassidula nucleus, Austruca triangularis, Littorina undulate, Chricoreus capucinus, dan Pirenella alata) dengan kelimpahan berkisar antara 0,06-14,10 ind/m2 dan kelimpahan relatif berkisar antara 0% – 53%. Terdapat tujuh jenis mangrove yang ditemukan yaitu Rhizophora mucronata, Rhizophora apiculata, Bruguiera gymnorrhiza, Sonneratia alba, Xylocarpus moluccensis, Xylocarpus granatum, dan Lumnitzera racemose dengan kerapatan berkisar 200 – 3267 tegakan/ha. Lingkungan pada daerah penelitian menunjukan kondisi normal dan mendukung bagi pertumbuhan epifauna dan mangrove di Tahura Ngurah Rai Rai, Bali.

MORPHOREGRESSION AND FIRST SIZE AT MATURITY OF GOLDSTRIPE SARDINELLA (SARDINELLA GIBBOSA) FROM BALI STRAIT WATERS

Bali Strait was one of the highest density areas for small pelagic fish in Indonesian Fisheries Management Area (FMA)-573 with goldstripe sardinella (Sardinella gibbosa) as was one of the abundant species in the catch. The aims of this study were to reveal the morphoregression characteristics and the first size of maturity for Sardinella gibbosa in Bali Strait waters. A total of 1.282 goldstripe sardinella were measured in total length (TL), fork length (FL), and standard length (SL)) and weighed during the study. All of the length measurement methods were highly related to the weight, which were W = 4 x 10-6 TL3,1686 (R² = 0,9817); W = 4 x 10-6 FL3,2334 (R² = 0,9732); and W = 1 x 10-5 SL3,0239 (R² = 0,9656), respectively. Among all the measurement methods, total length estimated the weight more accurately than the others. The growth pattern of goldstripe sardinella in this study were various based on the measurement method, sex, and the maturity level of the fish. A total of 800 individuals were dissected and their gonads examined. The sex was identified by visual characteristics. The size at 50% maturity for goldstripe sardinella in Bali Strait was 148 mm TL for male and 155 mm TL for female. Most of the caught fish were under the size at 50% maturity

KARAKTER MORFOMETRIK DAN MERISTIK IKAN EKOR PEDANG (Xiphophorus helleri Heckel, 1848) DI DANAU BUYAN, BULELENG, BALI

Ikan ekor pedang bukan merupakan ikan asli Indonesia. Ikan ini berasal dari Amerika Tengah dan dilaporkan menyebabkan kerugian di beberapa perairan yang dihuninya. Ikan ekor pedang merupakan ikan kedua yang paling banyak tertangkap di Danau Buyan. Penelitian ini bertujuan untuk mengungkap karakter morfometrik dan meristik, hubungan panjang bobot dan hubungan panjang total-panjang baku pada dua varian ikan ekor pedang di Danau Buyan yang memiliki warna tubuh yang berbeda. Penelitian dilakukan pada bulan Januari sampai April 2018. Ikan yang diamati berjumlah 160 ekor. Pengamatan meliputi pengukuran 12 karakter morfometrik tradisional, 14 karakter truss morphometric, penghitungan empat karakter meristik, dan penimbangan bobot. Panjang total ikan ekor pedang jantan dan betina pada varian I adalah 43,94 - 79,47 mm dan 43,81 - 115,80 mm dengan nilai b= 2,90 dan b= 2,98. Kemudian, panjang total ikan ekor pedang pada varian II adalah 45,76 - 83,91 mm untuk ikan jantan dan 41,43 - 88,49 mm untuk ikan betina dengan nilai b= 2,80 dan b= 3,07. Karakter meristik pada kedua varian ikan ekor pedang baik jantan dan betina adalah D. 12-13 ; A. 8 - 9. Hubungan panjang bobot ikan ekor pedang pada kedua varian menunjukan pertumbuhan isometrik. Berdasarkan pengamatan dalam penelitian ini, diketahui tidak terdapat perbedaan pada dua varian ikan ekor pedang di Danau Buyan.Green swordtail is not originally from Indonesia, but from Central America. This fish was reported harmful in some freshwater ecosystem. Green swordtail was the second most caught fish in Buyan Lake. The aims of this research were to reveal morphometric and meristic characters, length-weight relationship and total length-standard length relationship on two variants of green swordtail with the different color in Buyan Lake. This research was conducted from January to April 2018 in Buyan Lake. The number of measured and weighed fish were 160 individuals. There were 12 traditional morphometric characters, 14 truss morphometric characters, and four meristic characters observed. Respectively, the total length for green swordtail variant I male and female were 43.94 - 79.47 mm and 43.81 - 115.80 mm. The b value for both of the variant I were 2.90 and 2.98. For the variant II, the total length was 45.76 - 83.91 mm for male fish and 41.43 - 88.49 for female. The b value for variant II were 2.80 and 3.07 for male and female respectively. Meristic characters for all variant and sex was D 12 - 13; A 8 - 9. The growth pattern was isometric. There is no difference in the body shape between the variant of green swordtail fish

Aspek Reproduksi Ikan Nyalian (Barbodes binotatus Valenciennes, 1842) di Danau Tamblingan

The reproduction aspects of spotted barb (Barbodes binotatus Valenciennes, 1842) in Tamblingan Lake are not yet known, so that efforts to manage the resources of this fish cannot be carried out. This study aims to determine the reproduction aspects of spotted barb in Tamblingan Lake. Sampling was conducted from January to June 2019. This research used descriptive and quantitative methods. Purposive sampling method used for catched the spotted barb at five stations. Sampling was done once in a month. The fish were collected used gill net with a mesh size of 0.5; 1.0; 1.5; 2.0; 2.5; 3.0 cm. The samples of spotted barb that found during data collection were 208 individuals. The results showed that the ratio between the sex ratio of male and female spotted barb was 1.17: 1 which indicates a balanced sex ratio, with the gonad maturity stage of male fish more varied (I-IV) than female fish (III and IV). The highest average gonadosomatic index (male and female) was found in March and the lowest in January. The fecundity ranges from 57-23,897 eggs.Aspek reproduksi ikan nyalian (Barbodes binotatus Valenciennes, 1842) di Danau Tamblingan belum diketahui, sehingga upaya pengelolaan sumber daya ikan ini belum dapat dilakukan. Penelitian ini bertujuan untuk mengetahui aspek reproduksi ikan nyalian di Danau Tamblingan. Sampling dilakukan kurun waktu Januari-Juni 2019. Penelitian ini menggunakan metode deskriptif dan kuantitatif. Pengambilan sampel menggunakan metode purposive sampling di lima titik stasiun. Pengambilan sampel dilakukan satu kali pada setiap bulan. Alat tangkap yang digunakan adalah jaring insang yang memiliki ukuran mata jaring 0,5; 1,0; 1,5; 2,0; 2,5; 3,0 cm. Sampel ikan nyalian yang ditemukan selama pengambilan data sebanyak 208 individu. Hasil penelitian menunjukkan bahwa perbandingan antara nisbah kelamin ikan nyalian jantan dan betina yaitu 1,17:1 yang menunjukkan nisbah kelamin seimbang. Tingkat kematangan gonad (TKG) ikan jantan lebih bervariasi (I-IV), dibandingkan ikan betinanya (III dan IV). Rata-rata indeks kematangan gonad (IKG) tertinggi (jantan dan betina) ditemukan pada bulan Maret dan terendah pada bulan Januari. Fekunditasnya berkisar antara 57-23.897 butir

The Length-Length Relationships, Growth Pattern and Condition of Rasbora sp. in Tamblingan Lake, Bali Island

Rasbora sp. is one of native fish species that inhabit in Tamblingan Lake. Several publication that discussed about this species in other ecosystem was published, but very rare information in Tamblingan Lake. The aims of this research ware determine the length-length relationships, growth pattern and condition Rasbora sp. in Tamblingan Lake. Fish sampling conducted from January to December 2019 in Tamblingan Lake. The sampling method was purposive sampling which did alternately every month on five sampling station that representing the condition of Tamblingan Lake. The result shown, all character of length has strong correlation with body weight of fish, but the total length (TL) was the most accurate measure to estimating the body weight of Rasbora sp.  The growth pattern of Rasbora sp. was isometric and the condition of this fish in good condition

ASPEK BIOLOGIS IKAN EKOR PEDANG (Xiphophorus hellerii HECKEL, 1848) DI CATUR DANAU BALI

Ikan ekor pedang (Xiphophorus hellerii) merupakan jenis ikan asing yang mendiami catur danau Bali (Danau Tamblingan, Danau Buyan, Danau Bratan dan Danau Batur). Tujuan penelitian ini adalah untuk mengungkapkan nisbah kelamin, pola pertumbuhan dan kondisi ikan ekor pedang di catur danau Bali. Nisbah kelamin ikan ekor pedang di keempat danau berada dalam keadaan tidak seimbang. Proporsi ikan jantan di Danau Tamblingan, Danau Beratan dan Danau Batur lebih banyak daripada ikan betina dan kondisi sebaliknya ditemukan di Danau Buyan. Pola pertumbuhan ikan jantan di catur danau Bali adalah alometrik negatif dan ikan betina menunjukkan pola pertumbuhan alometrik negatif di Danau Tamblingan dan Danau Beratan dan pola pertumbuhan isometrik di Danau Buyan dan Danau Batur. Spesies ikan ini berada dalam kondisi baik di catur danau Bali dengan nilai faktor kondisi berkisar antara 0,47–1,54 dengan rerata 0,92 untuk ikan jantan dan 0,43–2,94 dengan rerata 1,12 untuk ikan betina.

Ichthyo-diversity of Batur Lake, Bali: A preliminary study

Batur Lake is the largest lake on Bali Island. Batur Lake has various potential fish resources. This study aims to determine the diversity of fish in Batur Lake waters. The research was conducted from November to December 2021. The method used in this research is the purposive sampling method. Using experimental gill nets, the samples were collected at the three stations covering Toya Bungkah, Seked, and Kedisan waters. The results showed that 516 individual fish comprised native and alien species. Native species were Osteochilus vittatus, Barbodes binotatus, Barbonymus gonionotus, Barbonymus balleroides, and Rasbora lateristriata; the others were alien species (7 species). Furthermore, based on the literature study, one of the native species that was collected is included in the IUCN red list with a vulnerable (VU) status, namely Rasbora lateristriata. Ichthyofauna in Batur Lake consisted of four orders, four families, and 12 species from native and alien species. The dominant species collected was alien species (Amphilophus citrinellus and Xiphophorus hellerii), while the one native species was Barbonymus balleroides. The highest values of diversity and uniformity indexes were found in Seked and Kedisan waters; meanwhile, the highest dominance index was found in Toya Bungkah waters